Baking With Cardboard/paper Cupcake Cups

Im really hoping to get some advice from those of you that use the cardboard/paper cupcake cups (such as this)

As these aren't fluted they dont fit into any of the cupcake pans that I own. I have placed them on a baking tray and popped them into the oven which seems to have worked fine but I was just wondering what others do. Is there a cupcake pan you can buy that has straight sides that these cups would fit into?
Also, when I use these cups and bake on a baking tray, I never get nice, even tops as I do using fluted liners in a fluted cupcake pan (the traditional sort which always produce a lovely even dome/surface). Any ideas why this may be the case? All I can think is that the heat isnt being distributed as evenly???

AAre you supposed to bake in them or are they just for decoration? Would you be able to bake in a normal cupcake wrapper or just in the pan and put them in those after baking? Just curious bc I have used some decorative cupcake wraps around regular ones but the decorative ones were lacy and not solid like those.

Slapsappyhappy you are supposed to bake in them, and they are great as they give a nice shape and height however I just cant get the tops even. Ive seen the cupcake wraps (which are gorgeous) but the cups im talking about are a different product :)

Matthewkyrankelly, out of curiosity, when you bake them with them do you get nice rounded tops/domes?

I will preface my answer with the fact that I used them for one special event and used one particular recipe. They did not bake nicely. I couldn't use about 30% of what baked for various cosmetic reasons. However, the recipe was very temperamental. That could have been the cause.